EDE Score
85/100
Verdict
Buy
CPED
$0.73 / effective day/day
Form
capsule
This article contains paid links. We may earn a commission if you purchase through these links. These commissions never influence our scoring. Read our methodology and editorial policy.
NAC comparison
Best NAC (N-Acetylcysteine) Supplements Compared (2026): EDE Scored Reviews
NAC (N-Acetylcysteine) is the rate-limiting precursor for glutathione synthesis, the body's primary intracellular antioxidant. Clinical evidence supports use for liver protection, mucolytic effects (FDA-approved drug Mucomyst inhalation), mood and compulsive behavior modulation (Berk 2008), and male fertility (Safarinejad 2009). Clinical effective dose: 600-2400 mg/day depending on endpoint.
Both products in our catalog deliver standard N-Acetyl-L-Cysteine. The Editor's Pick at the value tier includes selenium and molybdenum cofactors for full glutathione system function; the premium tier delivers single-ingredient pure NAC at Tier 1 practitioner-grade brand quality.
Editor's Pick
Thorne
NAC - N-Acetylcysteine 500 mg (90 Capsules)
EDE Score
85/100Verdict
Buy
CPED
$0.73 / effective day/day
Thorne NAC 500mg scores 85/100 BUY. Tier 1 practitioner-grade NAC with single-ingredient purity, Third-Party Certified, $0.73 CPED. Premium tier complement to Now Foods value-tier in DosedWise NAC dual-tier coverage.
Best Value
Now Foods
NAC 600 mg with Selenium and Molybdenum (250 Veg Capsules)Buy$0.18 / effective day/day
Approximately $201/year cheaper than the Top Pick at clinical full dose.
Read full review →Full comparison
Sorted by EDE Score (highest first). Tap a product name to read the full review.
EDE Score
83/100
Verdict
Buy
CPED
$0.18 / effective day/day
Best value
Form
capsule
| Product | Verdict | EDE | Form / Dose | CPED | Cert | Buy |
|---|---|---|---|---|---|---|
| Buy | 85/100 | capsule2 capsule | $0.73 / effective day/day | Standard | ||
| Buy | 83/100 | capsule2 capsule | $0.18 / effective day/day Best value | Standard |
Frequently asked questions
- Why include selenium and molybdenum with NAC?
- Selenium is the cofactor for glutathione peroxidase, the enzyme that uses glutathione to neutralise hydrogen peroxide. Without adequate selenium, raising glutathione via NAC produces less downstream antioxidant capacity. Molybdenum supports sulfite oxidase, which detoxifies sulfites produced from NAC metabolism. The cofactor inclusion is mechanistically appropriate.
- Was NAC banned by the FDA?
- No. FDA briefly raised regulatory concerns in July 2020, claiming NAC was first approved as a drug pre-DSHEA. Industry pushed back; in August 2022 FDA issued final guidance allowing NAC supplements to remain on market under enforcement discretion policy. NAC is firmly established as a legal supplement.
- How much NAC should I take?
- General antioxidant and glutathione support: 600-1200 mg/day. Liver protection during alcohol or environmental exposure: 1200-1800 mg/day. Mental health endpoints (OCD, bipolar maintenance): 1200-2400 mg/day per Berk 2008. Most products dose 500-600 mg per capsule; 2 capsules daily covers the general support tier.
- Does NAC have side effects?
- Generally well-tolerated. Mild GI symptoms (bloating, sulfur-tinged burps) common in the first week, typically resolving by day 14. Major contraindications: concurrent nitroglycerin without physician supervision (NAC can potentiate vasodilation), and asthma patients with prior bronchospasm history.